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韓國人胎兒舌骨에 關한 形態學的 硏究

Morphological Studies on the Hyoid Bone of Korean Fetuses

최신의학 1964년 7권 6호 p.71 ~ 91
김수철,
소속 상세정보
김수철 (  ) - 서울대학교 치과대학

Abstract


Three hundred and fourtysix hyoid bones of Korean fetuses(male 183, female : 163) aged from the fourth., month to the tenth month in utero were studied on their morphology, ossification and developments. The results were as follows :
1) The greatest transverse diameter was 7.60 mm and the greatest sagittal diameter was 5.90 mm in theAfourth month´s fetuses. These measurements were increased 2mm per one month. The tenth month´s fetuses showed almost three times larger in their diameter than the fourth month´s fetuses.
2) The height, transevers diameter and thickness of hyoid bone were 2.70mm, 4.90mm and 0.63mm . respectively. These measurements were regularly increased according to the increase of the age of the´ fetuses. At the tenth month, the height of hyoid bone grew 2.4 times. the transverse diameter 2.9 times, and the thickness 2.9 times comparing with the fourth. month´s fetuses.
3) The length, width and thickness of greater cornua of the fourth month´s fetuses were 5.50mm, 1.10mm and 0.63mm respectively. These measurements were regularly increased according to the increase of the age of the fetuses.
Finally at the last month in utero, the measurements were 2.7 times greater in length. 2.6 times in width and 2.8 times in thickness comparing with the fourth month´s fetuses.
4) The angle between greater cornua and body of hyoid bone was 104-109.
The angle between left and right greater cornua was 29-43.
Those two angles were not influenced by the increase of the age of the fetuses.
5) The shape of hyoid bone were divided into several groups. U shape was the most common and the next one was trapezoid.
In the early stage of the embryo life, half round shape was more common.
6) The direction of curvature of greater cornua in sagital plane external and downward curvature were the most common. Upward curvature was the least.
7) The most common-shape of the body of the hyoid bone was an ellipse and the remaining were irregular hexagonal. The curvature of the ridge on the frontal surface of the body of the hyoid bone was increased by the increase of the age of the fetuses.
8) In most cases, the attachements of lesser cornu to greater cornua were found on the end of greater cornua and the remaining cases were on the body of the greater cornua.
9) First ossification in the body of hyoid bone was occured at the sixth month and in greater cornua at the eighth month. The number of ossification center in the body of hyoid bone and in the greater cornua were single.
The growing rate of the ossification center was more rapid than that of the hyoid bone itself.
10) Neither any significant data were found between male and female nor between left and right.
11) No significant racial, difference between Japanese embryos and Korean embryos.

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